Rename Vool to Sol

Simple is really the descriptive name for the layer
Sure, it is "virtual" but that is not as important as the fact that it is simple (or simplified)
Also objct (based really) is better, since orientated implies it is a little like that, but only orientated, not really it. Sol only has objects, nothing else
Just cause i was renaming anyway

lib/ruby/send_statement.rb

@@ -5,10 +5,10 @@ module Ruby
   #
   class SendStatement < CallStatement
 
-    def to_vool
+    def to_sol
       if @receiver.is_a?(ModuleName) and @receiver.name == :X
-        args = @arguments.collect { |arg| arg.to_vool }
-        return Vool::MacroExpression.new(name , args)
+        args = @arguments.collect { |arg| arg.to_sol }
+        return Sol::MacroExpression.new(name , args)
       end
       return require_file if( @name == :require_relative )
       return super
@@ -25,7 +25,7 @@ module Ruby
       end
       path = File.expand_path(  "../../../#{file}" , __FILE__)
       source = File.read(path)
-      RubyCompiler.compile( source ).to_vool
+      RubyCompiler.compile( source ).to_sol
     end
   end
   class SuperStatement < SendStatement